import { Canvas2DApplication, Application, TimerCallback, CanvasMouseEvent, CanvasKeyBoardEvent } from "./src/application"
import { Math2D, mat2d, MatrixStack, Size, vec2, Rectangle, Inset } from "./src/math2d";
class RenderState {
    public lineWidth: number = 1;
    public strokeStyle: string = 'red';
    public fillStyle: string = 'green';

    public clone (): RenderState {
        let state: RenderState = new RenderState();
        state.lineWidth = this.lineWidth;
        state.strokeStyle = this.strokeStyle;
        state.fillStyle = this.fillStyle;
        return state;
    }

    public toString (): string {
        return JSON.stringify( this, null, ' ' );
    }
}

class RenderStateStack {
    private _stack: RenderState[] = [ new RenderState() ];
    private get _currentState (): RenderState {
        return this._stack[ this._stack.length - 1 ];
    }

    public save (): void {
        this._stack.push( this._currentState.clone() );
    }

    public restore (): void {
        this._stack.pop();
    }

    public get lineWidth (): number {
        return this._currentState.lineWidth;
    }

    public set lineWidth ( value: number ) {
        this._currentState.lineWidth = value;
    }

    public get strokeStyle (): string {
        return this._currentState.strokeStyle;
    }

    public set strokeStyle ( value: string ) {
        this._currentState.strokeStyle = value;
    }

    public get fillStyle (): string {
        return this._currentState.strokeStyle;
    }

    public set fillStyle ( value: string ) {
        this._currentState.strokeStyle = value;
    }

    public printCurrentStateInfo (): void {
        console.log( this._currentState.toString() );
    }
}

export enum EImageFillType {
    STRETCH,
    REPEAT,
    REPEAT_X,
    REPEAT_Y
}

type TextAlign = 'start' | 'left' | 'center' | 'right' | 'end';

type TextBaseline = 'alphabetic' | 'hanging' | 'top' | 'middle' | 'bottom';

type FontType = "10px sans-serif" | "15px sans-serif" | "20px sans-serif" | "25px sans-serif";

type PatternRepeat = "repeat" | "repeat-x" | "repeat-y" | "no-repeat";

type FontStyle = "normal" | "italic" | "oblique";

type FontVariant = "normal" | "small-caps";

type FontWeight = "normal" | "bold" | "bolder" | "lighter" | "100" | "200" | "300" | "400" | "500" | "600" | "700" | "800" | "900";

type FontSize = "10px" | "12px" | "16px" | "18px" | "24px" | "50%" | "75%" | "100%" | "125%" | "150%" | "xx-small" | "x-small" | "small" | "medium" | "large" | "x-large" | "xx-large";

type FontFamily = "sans-serif" | "serif" | "courier" | "fantasy" | "monospace";

export enum ELayout {
    LEFT_TOP,
    RIGHT_TOP,
    RIGHT_BOTTOM,
    LEFT_BOTTOM,
    CENTER_MIDDLE,
    CENTER_TOP,
    RIGHT_MIDDLE,
    CENTER_BOTTOM,
    LEFT_MIDDLE
}

class TestApplication extends Canvas2DApplication {
    private _lineDashOffset: number = 0;
    private _linearGradient !: CanvasGradient;
    private _radialGradient !: CanvasGradient;
    private _pattern: CanvasPattern | null = null;

    private _img !: HTMLImageElement;

    private _mouseX: number = 0;
    private _mouseY: number = 0;

    public matrixStack: MatrixStack = new MatrixStack();

    public constructor ( canvas: HTMLCanvasElement ) {
        super( canvas );

        this.isSupportMouseMove = true;
        let stack: RenderStateStack = new RenderStateStack();
        stack.printCurrentStateInfo();
        stack.save();
        stack.lineWidth = 10;
        stack.fillStyle = 'black';
        stack.printCurrentStateInfo();
        stack.restore(); 
        stack.printCurrentStateInfo();

        // 添加计时器，以每秒30帧的速度运行
        // 使用bind方法绑定回调函数
        // this . addTimer ( this . timeCallback . bind ( this ) , 0.033 ) ;
        // this . loadImage ( ) ;
    }

    protected dispatchMouseMove ( evt: CanvasMouseEvent ): void {
       this . _mouseX = evt . canvasPosition . x ;
       this . _mouseY = evt . canvasPosition . y ;

       this . _hitted = Math2D . projectPointOnLineSegment ( 
           vec2 . create ( evt . canvasPosition . x , evt . canvasPosition . y ) ,
           this . lineStart , this . lineEnd , this . closePt ) ;
    }

    protected dispatchMouseUp ( evt: CanvasMouseEvent ): void {

    }

    protected dispatchKeyPress ( evt: CanvasKeyBoardEvent ): void {

    }

    public update ( elapsedMsec: number, intervalSec: number ): void {
        
    }

    public render (): void {
        if ( this.context2D !== null ) {
            this.context2D.clearRect( 0, 0, this.canvas.width, this.canvas.height );
            this.strokeGrid();
            //this.drawCanvasCoordCenter();
            //this.draw4Quadrant();

            this . drawMouseLineProjection ( ) ;

            this.drawCoordInfo(
                '[' + this._mouseX + ',' + this._mouseY + "]",
                this._mouseX,
                this._mouseY
            );
        }
    }

    /*******************************************4.1节代码************************************************ */
    private _drawRect ( x: number, y: number, w: number, h: number ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.lineWidth = 20;
            //this . context2D . lineCap = 'round';
            // this . context2D . lineJoin = 'miter' ;
            //this . context2D . miterLimit = 1.3 ;

            this.context2D.strokeStyle = 'blue';
            this.context2D.fillStyle = "grey";
            this.context2D.beginPath();
            this.context2D.moveTo( x, y );
            this.context2D.lineTo( x + w, y );
            this.context2D.lineTo( x + w, y + h );
            this.context2D.lineTo( x, y + h );
            this.context2D.closePath();
            this.context2D.fill();
            this.context2D.stroke();
            this.context2D.restore();
        }
    }

    public printLineStates (): void {
        if ( this.context2D !== null ) {
            console.log( " *********LineState********** " );
            console.log( " lineWidth : " + this.context2D.lineWidth );
            console.log( " lineCap : " + this.context2D.lineCap );
            console.log( " lineJoin : " + this.context2D.lineJoin );
            console.log( " miterLimit : " + this.context2D.miterLimit );
        }
    }

    private _updateLineDashOffset (): void {
        this._lineDashOffset++;
        if ( this._lineDashOffset > 10000 ) {
            this._lineDashOffset = 0;
        }
    }

    private _drawLineDashRect ( x: number, y: number, w: number, h: number ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.lineWidth = 2;
            //this . context2D . strokeStyle = 'blue' ;
            this.context2D.strokeStyle = 'rgb( 0 , 0 , 255 ) ';
            //this . context2D . strokeStyle = 'rgb( 0% , 0% , 100% ) ' ;
            //this . context2D . strokeStyle = 'rgb( 0% , 0% , 255 ) ' ;
            //this . context2D . fillStyle = "rgba( 0 , 255 , 0 , 0.5 )" ; 
            if ( this._linearGradient === undefined ) {
                this._linearGradient = this.context2D.createLinearGradient( x, y, x + w, y );
                //this . _linearGradient = this . context2D . createLinearGradient ( x , y, x  , y + h ) ;
                //this . _linearGradient = this . context2D . createLinearGradient ( x , y, x + w , y + h ) ;
                //this . _linearGradient = this . context2D . createLinearGradient ( x + w , y + h , x  , y) ;
                this._linearGradient.addColorStop( 0.0, 'rgba( 255 , 0 , 0 , 1 ) ' );
                this._linearGradient.addColorStop( 0.5, 'green' );
                this._linearGradient.addColorStop( 0.8, '#0000FF' );
                this._linearGradient.addColorStop( 1.0, 'black' );
            }

            if ( this._radialGradient === undefined ) {
                let centX: number = x + w * 0.5;
                let centY: number = y + h * 0.5;
                let radius: number = Math.min( w, h );
                radius *= 0.5;
                this._radialGradient = this.context2D.createRadialGradient( centX, centY, radius * 0.2, centX, centY, radius );
                //this . _linearGradient = this . context2D . createLinearGradient ( x , y, x  , y + h ) ;
                //this . _linearGradient = this . context2D . createLinearGradient ( x , y, x + w , y + h ) ;
                this._radialGradient.addColorStop( 0.0, 'rgba( 255 , 0 , 0 , 0.5 ) ' );
                this._radialGradient.addColorStop( 0.5, 'green' );
                this._radialGradient.addColorStop( 0.8, '#0000FF' );
                this._radialGradient.addColorStop( 1.0, 'black' );
            }

            this.context2D.fillStyle = this._linearGradient;
            //this . context2D . fillStyle = this . _radiusGradient ;
            //this . context2D . lineDashOffset = 0 ;
            this.context2D.setLineDash( [ 10, 5 ] );
            this.context2D.lineDashOffset = - this._lineDashOffset;
            //this . context2D . lineDashOffset = 5 ;
            this.context2D.beginPath();
            this.context2D.moveTo( x, y );
            this.context2D.lineTo( x + w, y );
            this.context2D.lineTo( x + w, y + h );
            this.context2D.lineTo( x, y + h );
            this.context2D.closePath();
            this.context2D.fill();
            this.context2D.stroke();
            this.context2D.restore();
        }
    }

    public timeCallback ( id: number, data: any ): void {
        this._updateLineDashOffset();
        this._drawLineDashRect( 10, 10, this.canvas.width - 20, this.canvas.height - 20 );
    }

    /*
   public start ( ) : void {
       this . addTimer ( (id : number , data : any) : void => {
           this . timeCallback ( id , data ) ;
       } , 0.05) ;
       super . start ( ) ;
   }*/

    public static Colors: string[] = [
        'aqua',    //浅绿色
        'black',   //黑色
        'blue',    //蓝色 
        'fuchsia', //紫红色
        'gray',     //灰色
        'green',   //绿色
        'lime',    //绿黄色
        'maroon',  //褐红色
        'navy',    //海军蓝
        'olive',   //橄榄色
        'orange',  //橙色
        'purple',  //紫色
        'red',      //红色
        'silver',  //银灰色
        'teal',    //蓝绿色
        'yellow',   //黄色
        'white'   //白色
    ];

    public fillLinearRect ( x: number, y: number, w: number, h: number ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            if ( this._linearGradient === undefined ) {
                this._linearGradient = this.context2D.createLinearGradient( x, y, x + w, y );
                // this . _linearGradient = this . context2D . createLinearGradient ( x , y , x , y + h ) ;
                // this . _linearGradient = this . context2D . createLinearGradient ( x , y , x + w , y + h ) ;
                // this . _linearGradient = this . context2D . createLinearGradient ( x + w , y + h , x , y) ;
                this._linearGradient.addColorStop( 0.0, 'grey' );
                this._linearGradient.addColorStop( 0.25, 'rgba( 255 , 0 , 0 , 1 ) ' );
                this._linearGradient.addColorStop( 0.5, 'green' );
                this._linearGradient.addColorStop( 0.75, '#0000FF' );
                this._linearGradient.addColorStop( 1.0, 'black' );
            }
            this.context2D.fillStyle = this._linearGradient;
            this.context2D.beginPath();
            this.context2D.rect( x, y, w, h );
            this.context2D.fill();
            this.context2D.restore();
        }
    }

    public fillRadialRect ( x: number, y: number, w: number, h: number ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            if ( this._radialGradient === undefined ) {
                let centX: number = x + w * 0.5;
                let centY: number = y + h * 0.5;
                let radius: number = Math.min( w, h );
                radius *= 0.5;
                this._radialGradient = this.context2D.createRadialGradient( centX, centY, radius * 0.8, centX, centY, radius );
                this._radialGradient.addColorStop( 0.0, 'black' );
                this._radialGradient.addColorStop( 0.25, 'rgba( 255 , 0 , 0 , 1 ) ' );
                this._radialGradient.addColorStop( 0.5, 'green' );
                this._radialGradient.addColorStop( 0.75, '#0000FF' );
                this._radialGradient.addColorStop( 1.0, 'white' );
            }
            this.context2D.fillStyle = this._radialGradient;
            this.context2D.fillRect( x, y, w, h );
            this.context2D.restore();
        }
    }

    public fillPatternRect ( x: number, y: number, w: number, h: number, repeat: PatternRepeat = "repeat" ): void {
        if ( this.context2D !== null ) {
            if ( this._pattern === undefined ) {
                let img: HTMLImageElement = document.createElement( 'img' ) as HTMLImageElement;
                img.src = './data/test.jpg';
                img.onload = ( ev: Event ): void => {
                    if ( this.context2D !== null ) {
                        this._pattern = this.context2D.createPattern( img, repeat );
                        this.context2D.save();
                        if ( this._pattern )
                            this.context2D.fillStyle = this._pattern;
                        this.context2D.beginPath();
                        this.context2D.rect( x, y, w, h );
                        this.context2D.fill();
                        this.context2D.restore();
                    }
                }
            } else {
                this.context2D.save();
                if ( this._pattern )
                    this.context2D.fillStyle = this._pattern;
                this.context2D.beginPath();
                this.context2D.rect( x, y, w, h );
                this.context2D.fill();
                this.context2D.restore();
            }
        }
    }
    public fillCircle ( x: number, y: number, radius: number, fillStyle: string | CanvasGradient | CanvasPattern = 'red' ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.fillStyle = fillStyle;
            this.context2D.beginPath();
            this.context2D.arc( x, y, radius, 0, Math.PI * 2 );
            this.context2D.fill();
            this.context2D.restore();
        }
    }

    public fillRectangleWithColor ( rect: Rectangle, color: string ): void {
        if ( rect.isEmpty() ) {
            return;
        }
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.fillStyle = color;
            this.context2D.fillRect( rect.origin.x, rect.origin.y, rect.size.width, rect.size.height );
            this.context2D.restore();
        }
    }

    public strokeLine ( x0: number, y0: number, x1: number, y1: number ): void {
        if ( this.context2D !== null ) {
            this.context2D.beginPath();
            this.context2D.moveTo( x0, y0 );
            this.context2D.lineTo( x1, y1 );
            this.context2D.stroke();
        }
    }

    public strokeCoord ( orginX: number, orginY: number, width: number, height: number, lineWidth: number = 3 ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.lineWidth = lineWidth;
            this.context2D.strokeStyle = 'red';
            this.strokeLine( orginX, orginY, orginX + width, orginY );
            this.context2D.strokeStyle = 'blue';
            this.strokeLine( orginX, orginY, orginX, orginY + height );
            this.context2D.restore();
        }
    }

    public strokeLocalCoord ( width: number, height: number, lineWidth: number = 1 ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.lineWidth = lineWidth;
            this.context2D.strokeStyle = 'red';
            this.strokeLine( 0, 0, width, 0 );
            this.context2D.strokeStyle = 'blue';
            this.strokeLine( 0, 0, 0, height );
            this.context2D.restore();
        }
    }

    public strokeCircle ( x: number, y: number, radius: number, color: string = 'red', lineWidth: number = 1 ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.strokeStyle = color;
            this.context2D.lineWidth = lineWidth;
            this.context2D.beginPath();
            this.context2D.arc( x, y, radius, 0, Math.PI * 2 );
            this.context2D.stroke();
            this.context2D.restore();
        }
    }

    public strokeRect ( x: number, y: number, w: number, h: number, color: string = 'black' ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.strokeStyle = color;
            this.context2D.beginPath();
            this.context2D.moveTo( x, y );
            this.context2D.lineTo( x + w, y );
            this.context2D.lineTo( x + w, y + h );
            this.context2D.lineTo( x, y + h );
            this.context2D.closePath();
            this.context2D.stroke();
            this.context2D.restore();
        }
    }

    public strokeGrid ( color: string = 'grey', interval: number = 10 ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.strokeStyle = color;
            this.context2D.lineWidth = 0.5;
            for ( let i: number = interval + 0.5; i < this.canvas.width; i += interval ) {
                this.strokeLine( i, 0, i, this.canvas.height );
            }
            for ( let i: number = interval + 0.5; i < this.canvas.height; i += interval ) {
                this.strokeLine( 0, i, this.canvas.width, i );
            }
            this.context2D.restore();
            this.fillCircle( 0, 0, 5, 'green' );
            this.strokeCoord( 0, 0, this.canvas.width, this.canvas.height );
        }
    }

    /*******************************************4.2节代码************************************************ */
    public printTextStates (): void {
        if ( this.context2D !== null ) {
            console.log( " *********TextState********** " );
            console.log( " font : " + this.context2D.font );
            console.log( " textAlign : " + this.context2D.textAlign );
            console.log( " textBaseline : " + this.context2D.textBaseline );
        }
    }

    public fillText ( text: string, x: number, y: number, color: string = 'white', align: TextAlign = 'left', baseline: TextBaseline = 'top', font: FontType = '10px sans-serif' ): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.textAlign = align;
            this.context2D.textBaseline = baseline;
            this.context2D.font = font;
            this.context2D.fillStyle = color;
            this.context2D.fillText( text, x, y );
            this.context2D.restore();
        }
    }

    public testCanvas2DTextLayout (): void {
        let x: number = 20;
        let y: number = 20;
        let width: number = this.canvas.width - x * 2;
        let height: number = this.canvas.height - y * 2;
        let drawX: number = x;
        let drawY: number = y;
        let radius: number = 3;

        this.fillRectWithTitle( x, y, width, height );
        this.fillText( "left-top", drawX, drawY, 'white', 'left', 'top' /*, '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'black' );

        drawX = x + width;
        drawY = y;
        this.fillText( "right-top", drawX, drawY, 'white', 'right', 'top' /* , '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'black' );

        drawX = x + width;
        drawY = y + height;
        this.fillText( "right-bottom", drawX, drawY, 'white', 'right', 'bottom' /* , '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'black' );

        drawX = x;
        drawY = y + height;
        this.fillText( "left-bottom", drawX, drawY, 'white', 'left', 'bottom' /* , '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'black' );

        drawX = x + width * 0.5;
        drawY = y + height * 0.5;
        this.fillText( "center-middle", drawX, drawY, 'black', 'center', 'middle' /* , '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'red' );

        drawX = x + width * 0.5;
        drawY = y;
        this.fillText( "center-top", drawX, drawY, 'blue', 'center', 'top' /* , '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'black' );

        drawX = x + width;
        drawY = y + height * 0.5;
        this.fillText( "right-middle", drawX, drawY, 'blue', 'right', 'middle' /* , '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'black' );

        drawX = x + width * 0.5;
        drawY = y + height;
        this.fillText( "center-bottom", drawX, drawY, 'blue', 'center', 'bottom' );
        this.fillCircle( drawX, drawY, radius, 'black' );

        drawX = x;
        drawY = y + height * 0.5;
        this.fillText( "left-middle", drawX, drawY, 'blue', 'left', 'middle' /* , '20px sans-serif' */ );
        this.fillCircle( drawX, drawY, radius, 'black' );
    }

    public calcTextSize ( text: string, char: string = 'W', scale: number = 0.5 ): Size {
        if ( this.context2D !== null ) {
            let size: Size = new Size();
            size.width = this.context2D.measureText( text ).width;
            let w: number = this.context2D.measureText( char ).width;
            size.height = w + w * scale;
            return size;
        }

        alert( " context2D 渲染上下文为null " );
        throw new Error( " context2D 渲染上下文为null " );
    }

    public calcLocalTextRectangle ( layout: ELayout, text: string, parentWidth: number, parentHeight: number ): Rectangle {
        let s: Size = this.calcTextSize( text );
        let o: vec2 = vec2.create();
        let left: number = 0;
        let top: number = 0;
        let right: number = parentWidth - s.width;
        let bottom: number = parentHeight - s.height;
        let center: number = right * 0.5;
        let middle: number = bottom * 0.5;
        switch ( layout ) {
            case ELayout.LEFT_TOP:
                o.x = left;
                o.y = top;
                break;
            case ELayout.RIGHT_TOP:
                o.x = right;
                o.y = top;
                break;
            case ELayout.RIGHT_BOTTOM:
                o.x = right;
                o.y = bottom;
                break;
            case ELayout.LEFT_BOTTOM:
                o.x = left;
                o.y = bottom;
                break;
            case ELayout.CENTER_MIDDLE:
                o.x = center;
                o.y = middle;
                break;
            case ELayout.CENTER_TOP:
                o.x = center;
                o.y = 0;
                break;
            case ELayout.RIGHT_MIDDLE:
                o.x = right;
                o.y = middle;
                break;
            case ELayout.CENTER_BOTTOM:
                o.x = center;
                o.y = bottom;
                break;
            case ELayout.LEFT_MIDDLE:
                o.x = left;
                o.y = middle;
                break;
        }
        return new Rectangle( o, s );
    }

    public fillRectWithTitle ( x: number, y: number, width: number, height: number, title: string = '', layout: ELayout = ELayout.CENTER_MIDDLE, color: string = 'grey', showCoord: boolean = true ): void {
        if ( this.context2D !== null ) {

            this.context2D.save();
            this.context2D.fillStyle = color;
            this.context2D.beginPath();
            this.context2D.rect( x, y, width, height );
            this.context2D.fill();
            if ( title.length !== 0 ) {
                let rect: Rectangle = this.calcLocalTextRectangle( layout, title, width, height );
                this.fillText( title, x + rect.origin.x, y + rect.origin.y, 'white', 'left', 'top' /*, '10px sans-serif'*/ );
                this.strokeRect( x + rect.origin.x, y + rect.origin.y, rect.size.width, rect.size.height, 'rgba( 0 , 0 , 0 , 0.5 ) ' );
                this.fillCircle( x + rect.origin.x, y + rect.origin.y, 2 );
            }
            if ( showCoord ) {
                this.strokeCoord( x, y, width + 20, height + 20 );
                this.fillCircle( x, y, 3 );
            }

            this.context2D.restore();
        }
    }

    public testMyTextLayout ( font: string = this.makeFontString( "10px", "normal", "normal", "normal", 'sans-serif' ) ): void {

        let x: number = 20;
        let y: number = 20;
        let width: number = this.canvas.width - x * 2;
        let height: number = this.canvas.height - y * 2;
        let right: number = x + width;
        let bottom: number = y + height;

        let drawX: number = x;
        let drawY: number = y;
        let drawWidth: number = 150;
        let drawHeight: number = 50;

        if ( this.context2D !== null ) {

            this.context2D.save();
            this.context2D.font = font;
            this.fillRectWithTitle( x, y, width, height );
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'left-top', ELayout.LEFT_TOP, 'rgba( 255 , 255 , 0 , 0.2 )' );
            drawX = right - drawWidth;
            drawY = y;
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'right-top', ELayout.RIGHT_TOP, 'rgba( 255 , 255 , 0 , 0.2 )' );
            drawX = right - drawWidth;
            drawY = bottom - drawHeight;
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'right-bottom', ELayout.RIGHT_BOTTOM, 'rgba( 255 , 255 , 0 , 0.2 )' );
            drawX = x;
            drawY = bottom - drawHeight;
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'left-bottom', ELayout.LEFT_BOTTOM, 'rgba( 255 , 255 , 0 , 0.2 )' );
            drawX = ( right - drawWidth ) * 0.5;
            drawY = ( bottom - drawHeight ) * 0.5;
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'center-middle', ELayout.CENTER_MIDDLE, 'rgba( 255 , 0 , 0 , 0.2 )' );
            drawX = ( right - drawWidth ) * 0.5;
            drawY = y;
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'center-top', ELayout.CENTER_TOP, 'rgba( 0 , 255 , 0 , 0.2 )' );
            drawX = ( right - drawWidth );
            drawY = ( bottom - drawHeight ) * 0.5;
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'right-middle', ELayout.RIGHT_MIDDLE, 'rgba( 0 , 255 , 0 , 0.2 )' );
            drawX = ( right - drawWidth ) * 0.5;
            drawY = ( bottom - drawHeight );
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'center-bottom', ELayout.CENTER_BOTTOM, 'rgba( 0 , 255 , 0 , 0.2 )' );
            drawX = x;
            drawY = ( bottom - drawHeight ) * 0.5;
            this.fillRectWithTitle( drawX, drawY, drawWidth, drawHeight, 'left-middle', ELayout.LEFT_MIDDLE, 'rgba( 0 , 255 , 0 , 0.2 )' );
        }
    }

    public /* static */ makeFontString ( size: FontSize = '10px',
        weight: FontWeight = 'normal',
        style: FontStyle = 'normal',
        variant: FontVariant = 'normal',
        family: FontFamily = 'sans-serif',
    ): string {
        let strs: string[] = [];
        strs.push( style );
        strs.push( variant );
        strs.push( weight );
        strs.push( size );
        strs.push( family );
        let ret: string = strs.join( " " );
        console.log( ret );
        return ret;
    }

    /*******************************************4.3节代码************************************************ */
    public loadAndDrawImage ( url: string ): void {
        let img: HTMLImageElement = document.createElement( 'img' ) as HTMLImageElement;
        img.src = url;
        img.onload = ( ev: Event ): void => {
            if ( this.context2D !== null ) {
                /*
                // 在console控制台输出载入图像的尺寸
                console . log ( url + " 尺寸为 [ " + img . width + " , " + img . height + " ] " ) ;
                // 将srcImage保持原样的方式绘制到Canvas画布[ 10 , 10 ]的位置
                this . context2D . drawImage ( img , 10 , 10 ) ;
                // 将srcImage以拉伸缩放的方式绘制到Canvas画布指定的矩形中去
                this . context2D . drawImage ( img , img . width + 30  , 10 , 200 , img . height ) ;
                // 将srcImage的部分区域[ 44 , 6 , 162 , 175 , 200 ]以拉伸缩放的方式绘制到Canvas画布指定的矩形[ 200 , img . height + 30 , 200 , 130 ]中去
                this . context2D . drawImage ( img , 44 , 6 , 162 , 175 , 200 , img . height + 30 , 200 , 130  ) ;
                */
                //this . drawImage ( img , Rectangle .create ( 20, 20 , 540 , 300 ) , Rectangle . create ( 44 , 6 , 162 , 175 ) , EImageFillType . STRETCH ) ;
                // this . drawImage ( img , Rectangle .create ( 20, 20 , 100 , 50 ) , Rectangle . create ( 44 , 6 , 162 , 175 ) , EImageFillType . REPEAT ) ;
            }
        }
    }

    public drawImage ( img: HTMLImageElement | HTMLCanvasElement, destRect: Rectangle, srcRect: Rectangle = Rectangle.create( 0, 0, img.width, img.height ), fillType: EImageFillType = EImageFillType.STRETCH ): boolean {
        if ( this.context2D === null ) {
            return false;
        }

        if ( srcRect.isEmpty() ) {
            return false;
        }

        if ( destRect.isEmpty() ) {
            return false;
        }

        if ( fillType === EImageFillType.STRETCH ) {
            this.context2D.drawImage( img,
                srcRect.origin.x,
                srcRect.origin.y,
                srcRect.size.width,
                srcRect.size.height,
                destRect.origin.x,
                destRect.origin.y,
                destRect.size.width,
                destRect.size.height
            );
        } else {
            this.fillRectangleWithColor( destRect, 'grey' );
            let rows: number = Math.ceil( destRect.size.width / srcRect.size.width );
            let colums: number = Math.ceil( destRect.size.height / srcRect.size.height );
            let left: number = 0;
            let top: number = 0;
            let right: number = 0;
            let bottom: number = 0;
            let width: number = 0;
            let height: number = 0;
            let destRight: number = destRect.origin.x + destRect.size.width;
            let destBottom: number = destRect.origin.y + destRect.size.height;
            if ( fillType === EImageFillType.REPEAT_X ) {
                colums = 1;
            } else if ( fillType === EImageFillType.REPEAT_Y ) {
                rows = 1;
            }

            for ( let i: number = 0; i < rows; i++ ) {
                for ( let j: number = 0; j < colums; j++ ) {
                    left = destRect.origin.x + i * srcRect.size.width;
                    top = destRect.origin.y + j * srcRect.size.height;

                    width = srcRect.size.width;
                    height = srcRect.size.height;
                    right = left + width;
                    bottom = top + height;
                    if ( right > destRight ) {
                        width = srcRect.size.width - ( right - destRight );
                    }
                    if ( bottom > destBottom ) {
                        height = srcRect.size.height - ( bottom - destBottom );
                    }
                    this.context2D.drawImage( img,
                        srcRect.origin.x,
                        srcRect.origin.y,
                        width,
                        height,
                        left, top, width, height
                    );
                }
            }
        }
        return true;
    }

    public getColorCanvas ( amount: number = 32 ): HTMLCanvasElement {

        let step: number = 4;
        let canvas: HTMLCanvasElement = document.createElement( 'canvas' ) as HTMLCanvasElement;
        canvas.width = amount * step;
        canvas.height = amount * step;
        let context: CanvasRenderingContext2D | null = canvas.getContext( "2d" );
        if ( context === null ) {
            alert( "离屏Canvas获取渲染上下文失败！" );
            throw new Error( "离屏Canvas获取渲染上下文失败！" );
        }

        for ( let i: number = 0; i < step; i++ ) {
            for ( let j: number = 0; j < step; j++ ) {
                let idx: number = step * i + j;
                context.save();
                context.fillStyle = TestApplication.Colors[ idx ];
                context.fillRect( i * amount, j * amount, amount, amount );
                context.restore();
            }
        }

        return canvas;
    }

    public drawColorCanvas (): void {
        let colorCanvas: HTMLCanvasElement = this.getColorCanvas();
        this.drawImage( colorCanvas,
            Rectangle.create( 100, 100, colorCanvas.width, colorCanvas.height ) );
    }

    public testChangePartCanvasImageData ( rRow: number = 2, rColum: number = 0, cRow: number = 1, cColum: number = 0, size: number = 32 ): void {
        let colorCanvas: HTMLCanvasElement = this.getColorCanvas( size );
        let context: CanvasRenderingContext2D | null = colorCanvas.getContext( "2d" );

        if ( context === null ) {
            alert( "Canvas获取渲染上下文失败！" );
            throw new Error( "Canvas获取渲染上下文失败！" );
        }
        // this . setShadowState ( ) ;
        this.drawImage( colorCanvas,
            Rectangle.create( 100, 100, colorCanvas.width, colorCanvas.height ) );

        let imgData: ImageData = context.createImageData( size, size );

        let data: Uint8ClampedArray = imgData.data;
        let rbgaCount: number = data.length / 4;

        for ( let i = 0; i < rbgaCount; i++ ) {
            data[ i * 4 + 0 ] = 255;
            data[ i * 4 + 1 ] = 0;
            data[ i * 4 + 2 ] = 0;
            data[ i * 4 + 3 ] = 255;
        }

        context.putImageData( imgData, size * rColum, size * rRow, 0, 0, size, size );
        imgData = context.getImageData( size * cColum, size * cRow, size, size );
        data = imgData.data;
        let component: number = 0;
        for ( let i: number = 0; i < imgData.width; i++ ) {
            for ( let j: number = 0; j < imgData.height; j++ ) {
                for ( let k: number = 0; k < 4; k++ ) {
                    let idx: number = ( i * imgData.height + j ) * 4 + k;
                    component = data[ idx ];
                    if ( idx % 4 !== 3 ) {
                        data[ idx ] = 255 - component;
                    }
                }
            }
        }
        context.putImageData( imgData, size * cColum, size * cRow, 0, 0, size, size );
        this.drawImage( colorCanvas,
            Rectangle.create( 300, 100, colorCanvas.width, colorCanvas.height ) );
    }

    public loadImage (): void {
        if ( this._img !== undefined ) {
            return;
        }

        let img: HTMLImageElement = document.createElement( 'img' ) as HTMLImageElement;
        img.src = './data/test.jpg';
        img.onload = ( ev: Event ): void => {
            this._img = img;
        }
    }

    public isImgLoaded (): boolean {
        return this._img !== undefined;
    }

    public printPixelsColor ( x: number, y: number, w: number, h: number ): void {
        if ( this.context2D !== null ) {
            let imgData: ImageData = this.context2D.getImageData( x, y, w, h );
            console.log( imgData.data );
        }
    }

    /*******************************************4.4节代码************************************************ */


    public printShadowStates (): void {
        if ( this.context2D !== null ) {
            console.log( "*********ShadowState**********" );
            console.log( " shadowBlur : " + this.context2D.shadowBlur );
            console.log( " shadowColor : " + this.context2D.shadowColor );
            console.log( " shadowOffsetX : " + this.context2D.shadowOffsetX );
            console.log( " shadowOffsetY : " + this.context2D.shadowOffsetY );
        }
    }

    public setShadowState ( shadowBlur: number = 5, shadowColor: string = "rgba( 127 , 127 , 127 , 0.5 )", shadowOffsetX: number = 10, shadowOffsetY: number = 10 ): void {
        if ( this.context2D !== null ) {
            this.context2D.shadowBlur = shadowBlur;
            this.context2D.shadowColor = shadowColor;
            this.context2D.shadowOffsetX = shadowOffsetX;
            this.context2D.shadowOffsetY = shadowOffsetY;
        }
    }

    /*******************************************全部渲染状态输出代码************************************************ */
    public printAllRenderStates (): void {
        if ( this.context2D !== null ) {
            console.log( " *********LineState********** " );
            console.log( " lineWidth : " + this.context2D.lineWidth );
            console.log( " lineCap : " + this.context2D.lineCap );
            console.log( " lineJoin : " + this.context2D.lineJoin );
            console.log( " miterLimit : " + this.context2D.miterLimit );

            console.log( " *********LineDashState********** " );
            console.log( " lineDashOffset : " + this.context2D.lineDashOffset );

            console.log( " *********ShadowState********** " );
            console.log( " shadowBlur : " + this.context2D.shadowBlur );
            console.log( " shadowColor : " + this.context2D.shadowColor );
            console.log( " shadowOffsetX : " + this.context2D.shadowOffsetX );
            console.log( " shadowOffsetY : " + this.context2D.shadowOffsetY );

            console.log( "*********TextState**********" );
            console.log( " font : " + this.context2D.font );
            console.log( " textAlign : " + this.context2D.textAlign );
            console.log( " textBaseline : " + this.context2D.textBaseline );

            console.log( "*********RenderState**********" );
            console.log( " strokeStyle : " + this.context2D.strokeStyle );
            console.log( " fillStyle : " + this.context2D.fillStyle );
            console.log( " globalAlpha : " + this.context2D.globalAlpha );
            console.log( " globalCompositeOperation : " + this.context2D.globalCompositeOperation );
        }
    }

    public drawRect1 (): void {
        if ( this.context2D !== null ) {
            this.context2D.save();
            this.context2D.lineWidth = 10;
            this.context2D.fillStyle = "rgba(255,0,0,0.5)"; // 很重要一点alpha必须是0-1之间的数字
            this.context2D.strokeStyle = 'blue';
            this.context2D.fillRect( this.context2D.canvas.width * 0.5, this.context2D.canvas.height * 0.5, this.context2D.canvas.width * 0.5, this.context2D.canvas.height * 0.5 );
            this.context2D.strokeRect( this.context2D.canvas.width * 0.5, this.context2D.canvas.height * 0.5, this.context2D.canvas.width * 0.5, this.context2D.canvas.height * 0.5 );
            this.context2D.restore();
        }
    }

    public drawRect2 (): void {
        if ( this.context2D !== null ) {
            this.context2D.fillStyle = "rgba(0,255,0,0.5)";
            this.context2D.strokeStyle = 'red';
            this.context2D.beginPath();
            this.context2D.rect( 0, 0, this.context2D.canvas.width * 0.5, this.context2D.canvas.height * 0.5 );
            this.context2D.stroke();
            this.context2D.fill();
        }
    }

    public drawRect3 (): void {
        if ( this.context2D !== null ) {
            this.context2D.fillStyle = "rgba(0,0,255,0.5)";
            this.context2D.strokeStyle = 'red';
            this.context2D.beginPath();
            this.context2D.moveTo( this.context2D.canvas.width * 0.5, 0 );
            this.context2D.lineTo( this.context2D.canvas.width, 0 );
            this.context2D.lineTo( this.context2D.canvas.width, this.context2D.canvas.height * 0.5 );
            this.context2D.lineTo( this.context2D.canvas.width * 0.5, this.context2D.canvas.height * 0.5 );
            //this . context2D . closePath ( ) ;
            this.context2D.stroke();
            this.context2D.fill();
        }
    }

    /*******************************************第4章全部结束************************************************ */

    /*******************************************第5章坐标系变换代码************************************************ */

    /*******************************************5.1节代码************************************************ */
    public drawCanvasCoordCenter (): void {
        if ( this.context2D === null ) {
            return;
        }
        let halfWidth: number = this.canvas.width * 0.5;
        let halfHeight: number = this.canvas.height * 0.5;

        this.context2D.save();
        this.context2D.lineWidth = 2;
        this.context2D.strokeStyle = 'rgba( 255 , 0 , 0 , 0.5 ) ';

        this.strokeLine( 0, halfHeight, this.canvas.width, halfHeight );
        this.context2D.strokeStyle = 'rgba( 0 , 0 , 255 , 0.5 )';

        this.strokeLine( halfWidth, 0, halfWidth, this.canvas.height );
        this.context2D.restore();

        this.fillCircle( halfWidth, halfHeight, 5, 'rgba( 0 , 0 , 0 , 0.5 ) ' );
    }

    public drawCoordInfo ( info: string, x: number, y: number ): void {
        this.fillText( info, x, y, 'black', 'center', 'bottom' );
    }

    public distance ( x0: number, y0: number, x1: number, y1: number ): number {
        let diffX: number = x1 - x0;
        let diffY: number = y1 - y0;
        return Math.sqrt( diffX * diffX + diffY * diffY );
    }

    public setTransform ( mat: mat2d ): void {
        if ( this.context2D === null ) {
            return;
        }

        this.context2D.setTransform(
            mat.values[ 0 ],
            mat.values[ 1 ],
            mat.values[ 2 ],
            mat.values[ 3 ],
            mat.values[ 4 ],
            mat.values[ 5 ]
        );
    }

    public transform ( mat: mat2d ): void {
        if ( this.context2D === null ) {
            return;
        }

        this.context2D.transform(
            mat.values[ 0 ],
            mat.values[ 1 ],
            mat.values[ 2 ],
            mat.values[ 3 ],
            mat.values[ 4 ],
            mat.values[ 5 ]
        );
    }

    public fillLocalRectWithTitle ( width: number, height: number, title: string = '', referencePt: ELayout = ELayout.LEFT_TOP, layout: ELayout = ELayout.CENTER_MIDDLE, color: string = 'grey', showCoord: boolean = false ): void {
        if ( this.context2D !== null ) {

            let x: number = 0;
            let y: number = 0;

            switch ( referencePt ) {
                case ELayout.LEFT_TOP:
                    x = 0;
                    y = 0;
                    break;
                case ELayout.LEFT_MIDDLE:
                    x = 0;
                    y = - height * 0.5;
                    break;
                case ELayout.LEFT_BOTTOM:
                    x = 0;
                    y = - height;
                    break;
                case ELayout.RIGHT_TOP:
                    x = - width;
                    y = 0;
                    break;
                case ELayout.RIGHT_MIDDLE:
                    x = - width;
                    y = - height * 0.5;
                    break;
                case ELayout.RIGHT_BOTTOM:
                    x = - width;
                    y = - height;
                    break;
                case ELayout.CENTER_TOP:
                    x = - width * 0.5;
                    y = 0;
                    break;
                case ELayout.CENTER_MIDDLE:
                    x = - width * 0.5;
                    y = -height * 0.5;
                    break;
                case ELayout.CENTER_BOTTOM:
                    x = - width * 0.5;
                    y = -height;
                    break;
            }

            this.context2D.save();
            this.context2D.fillStyle = color;
            this.context2D.beginPath();
            this.context2D.rect( x, y, width, height );
            this.context2D.fill();
            if ( title.length !== 0 ) {
                let rect: Rectangle = this.calcLocalTextRectangle( layout, title, width, height );
                this.fillText( title, x + rect.origin.x, y + rect.origin.y, 'white', 'left', 'top' /*, '10px sans-serif'*/ );
                this.strokeRect( x + rect.origin.x, y + rect.origin.y, rect.size.width, rect.size.height, 'rgba( 0 , 0 , 0 , 0.5 ) ' );
                this.fillCircle( x + rect.origin.x, y + rect.origin.y, 2 );
            }
            if ( showCoord ) {
                this.strokeCoord( 0, 0, width + 20, height + 20 );
                this.fillCircle( 0, 0, 3 );
            }

            this.context2D.restore();
        }
    }

    public rotateTranslate ( degree: number, layout: ELayout = ELayout.LEFT_TOP, width: number = 40, height: number = 20 ): void {
        if ( this.context2D === null ) {
            return;
        }
        let radians: number = Math2D.toRadian( degree );
        this.context2D.save();
        this.context2D.rotate( radians );
        this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
        this.fillLocalRectWithTitle( width, height, '', layout );
        this.context2D.restore();
    }

    public rotateTranslate2 ( degree: number, u: number = 0, v: number = 0, width: number = 40, height: number = 20 ): void {
        if ( this.context2D === null ) {
            return;
        }
        let radians: number = Math2D.toRadian( degree );
        this.context2D.save();
        this.context2D.rotate( radians );
        this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
        this.fillLocalRectWithTitleUV( width, height, '', u, v );
        this.context2D.restore();
    }

    public testFillLocalRectWithTitle (): void {
        if ( this.context2D !== null ) {
            this.rotateTranslate( 0, ELayout.LEFT_TOP );
            this.rotateTranslate( 8, ELayout.LEFT_MIDDLE );
            this.rotateTranslate( 16, ELayout.LEFT_BOTTOM );
            this.rotateTranslate( 24, ELayout.CENTER_TOP );
            this.rotateTranslate( 32, ELayout.CENTER_MIDDLE );
            this.rotateTranslate( - 8, ELayout.CENTER_BOTTOM );
            this.rotateTranslate( - 16, ELayout.RIGHT_TOP );
            this.rotateTranslate( - 24, ELayout.RIGHT_MIDDLE );
            this.rotateTranslate( - 32, ELayout.RIGHT_BOTTOM );
            let radius: number = this.distance( 0, 0, this.canvas.width * 0.5, this.canvas.height * 0.5 );
            this.strokeCircle( 0, 0, radius, 'black' );
        }
    }

    public fillLocalRectWithTitleUV ( width: number, height: number, title: string = '', u: number = 0, v: number = 0, layout: ELayout = ELayout.CENTER_MIDDLE, color: string = 'grey', showCoord: boolean = true ): void {
        if ( this.context2D !== null ) {

            let x: number = - width * u;
            let y: number = - height * v;

            this.context2D.save();
            this.context2D.fillStyle = color;
            this.context2D.beginPath();
            this.context2D.rect( x, y, width, height );
            this.context2D.fill();
            if ( title.length !== 0 ) {
                let rect: Rectangle = this.calcLocalTextRectangle( layout, title, width, height );
                this.fillText( title, x + rect.origin.x, y + rect.origin.y, 'white', 'left', 'top' /*, '10px sans-serif'*/ );
                this.strokeRect( x + rect.origin.x, y + rect.origin.y, rect.size.width, rect.size.height, 'rgba( 0 , 0 , 0 , 0.5 ) ' );
                this.fillCircle( x + rect.origin.x, y + rect.origin.y, 2 );
            }
            if ( showCoord ) {
                this.strokeCoord( 0, 0, width + 20, height + 20 );
                this.fillCircle( 0, 0, 3 );
            }

            this.context2D.restore();
        }
    }

    public doTransform0 (): void {
        if ( this.context2D !== null ) {
            let width: number = 100;
            let height: number = 60;
            let x: number = this.canvas.width * 0.5;
            let y: number = this.canvas.height * 0.5;
            this.context2D.save();
            this.context2D.translate( x, y );
            this.fillRectWithTitle( 0, 0, width, height, '0度旋转' );
            this.context2D.restore();
        }
    }

    public doTransform ( degree: number, rotateFirst: boolean = true ): void {
        if ( this.context2D !== null ) {
            let radians: number = Math2D.toRadian( degree );

            let width: number = 100;
            let height: number = 60;

            this.context2D.save();
            this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
            //this . fillRectWithTitle ( 0 , 0  , width , height , '+' + degree + '度旋转'  ) ;
            this.fillLocalRectWithTitleUV( width, height, '0度旋转' );
            this.context2D.restore();

            this.context2D.save();
            if ( rotateFirst ) {
                this.context2D.rotate( radians );
                this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
            } else {
                this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
                this.context2D.rotate( radians );
            }
            //this . fillRectWithTitle ( 0 , 0  , 100 , 60 , '+' + degree + '度旋转'  ) ;
            this.fillLocalRectWithTitleUV( width, height, '+' + degree + '度旋转' );
            this.context2D.restore();

            this.context2D.save();
            if ( rotateFirst ) {
                this.context2D.rotate( - radians );
                this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );

            } else {
                this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
                this.context2D.rotate( - radians );
            }
            //this . fillRectWithTitle ( 0 , 0  , 100 , 60 , '-' + degree + '度旋转'  ) ;
            this.fillLocalRectWithTitleUV( width, height, '-' + degree + '度旋转' );
            this.context2D.restore();

            let radius: number = this.distance( 0, 0, this.canvas.width * 0.5, this.canvas.height * 0.5 );
            this.strokeCircle( 0, 0, radius, 'black' );

        }
    }

    public doLocalTransform (): void {
        if ( this.context2D === null ) {
            return;
        }
        let width: number = 100;
        let height: number = 60;
        let coordWidth: number = width * 1.2;
        let coordHeight: number = height * 1.2;
        let radius: number = 5;
        this.context2D.save();
        // 
        this.fillLocalRectWithTitle( width, height, '1. 初始状态' );
        this.strokeCoord( 0, 0, coordWidth, coordHeight );
        this.fillCircle( 0, 0, radius );

        this.context2D.translate( this.canvas.width * 0.5, 10 );
        this.fillLocalRectWithTitle( width, height, '2. 平移' );
        this.strokeCoord( 0, 0, coordWidth, coordHeight );
        this.fillCircle( 0, 0, radius );

        this.context2D.translate( 0, this.canvas.height * 0.5 - 10 );
        this.fillLocalRectWithTitle( width, height, '3. 平移到画布中心' );
        this.strokeCoord( 0, 0, coordWidth, coordHeight );
        this.fillCircle( 0, 0, radius );

        this.context2D.rotate( Math2D.toRadian( -120 ) );
        this.fillLocalRectWithTitle( width, height, '4. 旋转-120度' );
        this.strokeCoord( 0, 0, coordWidth, coordHeight );
        this.fillCircle( 0, 0, radius );

        this.context2D.rotate( Math2D.toRadian( -130 ) );
        this.fillLocalRectWithTitle( width, height, '5. 旋转-130度' );
        this.strokeCoord( 0, 0, coordWidth, coordHeight );
        this.fillCircle( 0, 0, radius );

        this.context2D.translate( 100, 100 );
        this.fillLocalRectWithTitle( width, height, '6. 局部平移100个单位' );
        this.strokeCoord( 0, 0, coordWidth, coordHeight );
        this.fillCircle( 0, 0, radius );

        //this . fillLocalRectWithTitle ( width * 1.5 , height * 2.0 , '' ) ;

        this.context2D.scale( 1.5, 2.0 );
        this.fillLocalRectWithTitle( width, height, '7. 缩放局部坐标系', ELayout.LEFT_MIDDLE );
        //this . fillLocalRectWithTitle ( width * 1.5 , height * 2.0 , '7. 放大物体尺寸' ) ;
        this.strokeCoord( 0, 0, coordWidth, coordHeight );
        this.fillCircle( 0, 0, radius );

        /*
        this . context2D . rotate ( Math2D . toRadian ( 70 ) ) ;
        this . fillLocalRectWithTitle ( width , height , '4. 继续旋转70度' ) ;

        this . context2D . translate ( 0 , 100 ) ;
        this . fillLocalRectWithTitle ( width , height , '5. y轴局部平移100像素' ) ;

        this . context2D .scale ( 1.5 , 1.0 ) ;
        this . fillLocalRectWithTitle (width , height , '6. x轴局部放大1.5倍' ) ;
        */
        this.context2D.restore();
    }

    private translateRotateTranslateDrawRect ( degree: number, u: number = 0, v: number = 0, radius = 200, width: number = 40, height: number = 20 ): void {
        if ( this.context2D === null ) {
            return;
        }
        let radians: number = Math2D.toRadian( degree );
        this.context2D.save();
        this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
        this.context2D.rotate( radians );
        this.context2D.translate( radius, 0 );
        this.fillLocalRectWithTitleUV( width, height, '', u, v );
        this.context2D.restore();
    }

    public testFillLocalRectWithTitleUV (): void {
        if ( this.context2D === null ) {
            return;
        }
        let radius: number = 200;
        let steps: number = 18;
        for ( let i = 0; i <= steps; i++ ) {
            let n: number = i / steps;
            this.translateRotateTranslateDrawRect( i * 10, n, 0, radius );
        }
        for ( let i = 0; i < steps; i++ ) {
            let n: number = i / steps;
            this.translateRotateTranslateDrawRect( - i * 10, 0, n, radius );
        }
        this.context2D.save();
        this.context2D.translate( this.canvas.width * 0.5 - radius * 0.4, this.canvas.height * 0.5 - radius * 0.4 );
        this.fillLocalRectWithTitleUV( 100, 60, 'u = 0.5 / v = 0.5', 0.5, 0.5 );
        this.context2D.restore();

        this.context2D.save();
        this.context2D.translate( this.canvas.width * 0.5 + radius * 0.2, this.canvas.height * 0.5 - radius * 0.2 );
        this.fillLocalRectWithTitleUV( 100, 60, 'u = 0 / v = 1', 0, 1 );
        this.context2D.restore();

        this.context2D.save();
        this.context2D.translate( this.canvas.width * 0.5 + radius * 0.3, this.canvas.height * 0.5 + radius * 0.4 );
        this.fillLocalRectWithTitleUV( 100, 60, 'u = 0.3 / v = 0.6', 0.3, 0.6 );
        this.context2D.restore();

        this.context2D.save();
        this.context2D.translate( this.canvas.width * 0.5 - radius * 0.1, this.canvas.height * 0.5 + radius * 0.25 );
        this.fillLocalRectWithTitleUV( 100, 60, 'u = 1 / v = 0.2', 1, 0.2 );
        this.context2D.restore();

        this.strokeCircle( this.canvas.width * 0.5, this.canvas.height * 0.5, radius, 'rgba( 0 , 255 , 255 , 0.5 )', 10 );
    }


    private _rotationSunSpeed: number = 50;
    private _rotationMoonSpeed: number = 100;
    private _revolutionSpeed: number = 60;

    private _rotationSun: number = 0;
    private _rotationMoon: number = 0;
    private _revolution: number = 0;

    public rotationAndRevolutionSimulation ( radius: number = 250 ): void {
        if ( this.context2D === null ) {
            return;
        }
        let rotationMoon: number = Math2D.toRadian( this._rotationMoon );
        let rotationSun: number = Math2D.toRadian( this._rotationSun );
        let revolution: number = Math2D.toRadian( this._revolution );

        this.context2D.save();
        this.context2D.translate( this.canvas.width * 0.5, this.canvas.height * 0.5 );
        this.context2D.save();
        this.context2D.rotate( rotationSun );
        this.fillLocalRectWithTitleUV( 100, 100, '自转', 0.5, 0.5 );
        this.context2D.restore();

        this.context2D.save();
        this.context2D.rotate( revolution );
        this.context2D.translate( radius, 0 );
        this.context2D.rotate( rotationMoon );
        this.fillLocalRectWithTitleUV( 80, 80, '自转+公转', 0.5, 0.5 );
        this.context2D.restore();
        this.context2D.restore();
    }
    /*******************************************5.2节代码************************************************ */
    public draw4Quadrant (): void {

        if ( this.context2D === null ) {
            return;
        }

        this.context2D.save();

        this.fillText( "第一象限", this.canvas.width, this.canvas.height, 'rgba( 0 , 0 , 255 , 0.5 )', 'right', 'bottom', "20px sans-serif" );
        this.fillText( "第二象限", 0, this.canvas.height, 'rgba( 0 , 0 , 255 , 0.5 )', 'left', 'bottom', "20px sans-serif" );
        this.fillText( "第三象限", 0, 0, 'rgba( 0 , 0 , 255 , 0.5 )', 'left', 'top', "20px sans-serif" );
        this.fillText( "第四象限", this.canvas.width, 0, 'rgba( 0 , 0 , 255 , 0.5 )', 'right', 'top', "20px sans-serif" );

        this.context2D.restore();
    }
    /*******************************************第6章代码************************************************ */

    /*******************************************6.1代码************************************************ */
    public drawVec ( len: number, arrowLen: number = 10, beginText: string = '', endText = '', lineWidth: number = 1, isLineDash: boolean = false, showInfo: boolean = true, alpha: boolean = false ): void {
        if ( this.context2D === null ) {
            return;
        }

        if ( len < 0 ) {
            arrowLen = - arrowLen;
        }

        this.context2D.save();
        this.context2D.lineWidth = lineWidth;

        if ( isLineDash ) {
            this.context2D.setLineDash( [ 2, 2 ] );
        }

        if ( lineWidth > 1 ) {
            this.fillCircle( 0, 0, 5 );
        } else {
            this.fillCircle( 0, 0, 3 );
        }

        this.context2D.save();
        if ( alpha === true ) {
            this.context2D.strokeStyle = 'rgba( 0 , 0 , 0 , 0.3 )';
        }

        this.strokeLine( 0, 0, len, 0 );

        this.context2D.save();
        this.strokeLine( len, 0, len - arrowLen, arrowLen );
        this.context2D.restore();

        this.context2D.save();
        this.strokeLine( len, 0, len - arrowLen, - arrowLen );
        this.context2D.restore();

        this.context2D.restore();

        let font: FontType = "15px sans-serif";


        if ( beginText != undefined && beginText.length != 0 ) {
            if ( len > 0 ) {
                this.fillText( beginText, 0, 0, 'black', 'right', 'bottom', font );
            } else {
                this.fillText( beginText, 0, 0, 'black', 'left', 'bottom', font );
            }
        }

        len = parseFloat( len.toFixed( 2 ) );

        if ( beginText != undefined && endText.length != 0 ) {
            if ( len > 0 ) {
                this.fillText( endText, len, 0, 'black', 'left', 'bottom', font );
            } else {
                this.fillText( endText, len, 0, 'black', 'right', 'bottom', font );
            }
        }

        if ( showInfo === true ) {
            this.fillText( Math.abs( len ).toString(), len * 0.5, 0, 'black', 'center', 'bottom', font );
        }

        this.context2D.restore();
    }

    public drawVecFromLine ( start : vec2 , end : vec2 , arrowLen : number = 10 , beginText : string = '' , endText = '' , lineWidth : number = 1 , isLineDash : boolean = false , showInfo : boolean = false , alpha : boolean = false ) : number {
        let angle : number = vec2 . getOrientation ( start , end , true ) ;
        if ( this . context2D !== null ) {
            let diff : vec2 = vec2 . difference ( end , start ) ;
            let len : number = diff . length ;
            this . context2D . save ( ) ;
                this . context2D . translate ( start . x , start . y ) ;
                this . context2D . rotate ( angle ) ;
                this . drawVec ( len , arrowLen , beginText , endText , lineWidth , isLineDash , showInfo , alpha) ;
            this . context2D . restore ( ) ;
        }
        return angle ;
    }

    public drawTriangle ( x0 : number , y0 : number , x1 : number , y1 : number , x2 : number , y2 : number , ptX : number = x2 , ptY : number = y2 , drawSubTriangle : boolean = false , stroke : boolean = true ) : void {

        if ( this . context2D === null ) {
            return ;
        }

        this . context2D . save ( ) ;
        this . context2D . lineWidth = 3 ;
        this . context2D . strokeStyle = 'rgba( 0 , 0 , 0 , 0.5 )';
        this . context2D . beginPath ( ) ;
        this . context2D . moveTo ( x0 , y0 ) ;
        this . context2D . lineTo ( x1 , y1 ) ;
        this . context2D . lineTo ( x2 , y2 ) ;
        this . context2D . closePath ( ) ;
        if ( stroke ) {
            this . context2D . stroke ( ) ;
        } else {
            this . context2D . fill ( ) ;
        }
        
        if ( drawSubTriangle === true ) {
            this . context2D . lineWidth = 2 ;
            this . context2D . setLineDash ( [ 3 , 3 ] ) ;
            this . strokeLine ( x0 , y0  , ptX , ptY) ;
            this . strokeLine ( x1 , y1 , ptX , ptY ) ;
            this . strokeLine ( x2 , y2 , ptX , ptY ) ;
        }

        this . fillCircle ( ptX , ptY , 5 ) ;
        this . context2D . restore ( ) ;
    }

    public drawPolygon ( points : vec2 [ ] , ptX : number , ptY : number , drawSubTriangle : boolean = false ) : void {
        if ( this . context2D === null ) return ;
        this . context2D . save ( ) ;
        this . context2D . strokeStyle = 'rgba( 0 , 0 , 0 , 0.5 )';
        this . context2D . lineWidth = 3 ;
        this . context2D . translate ( ptX , ptY ) ;
        this . context2D . beginPath ( ) ;
        this . context2D . moveTo (  points [ 0 ] . x , points [ 0 ] . y ) ;
        for ( let i = 1 ; i < points . length ; i ++ ) {
            this . context2D . lineTo ( points [ i ] . x , points [ i ] . y ) ;
        }
        this . context2D . closePath ( ) ;
        this . context2D . stroke ( ) ;
        if ( drawSubTriangle === true ) {
            this . context2D . lineWidth = 2 ; 
            this . context2D . setLineDash ( [ 3 , 3 ] ) ;
            for ( let i : number = 1 ; i < points . length - 1 ; i ++ ) {
                this . strokeLine ( points [ 0 ] . x , points [ 0 ] . y , points [ i ] . x , points [ i ] . y ) ;
            }
        }

        this . fillCircle ( points [ 0 ] . x , points [ 0 ] . y , 5 , 'red') ;
        this . context2D . restore ( ) ;
    }

/*******************************************6.2代码************************************************ */    
    public lineStart : vec2 = vec2 . create ( 150 , 150 ) ;
    public lineEnd : vec2 = vec2 . create ( 400 , 300 ) ; 
    public closePt : vec2 = vec2 . create ( ) ; 
    private _hitted : boolean = false ;

    public drawMouseLineProjection ( ) : void {
        if ( this . context2D != null ) {
            if ( this . _hitted === false ) {
                this . drawVecFromLine ( this . lineStart , this . lineEnd , 10 , this . lineStart . toString ( ) , this . lineEnd . toString ( ) , 1 , false , true ) ;                
            } else { 
                let angle : number = 0 ;
                let mousePt : vec2 = vec2 . create ( this . _mouseX , this . _mouseY ) ;

                this . context2D . save ( ) ;
                    angle = this . drawVecFromLine ( this . lineStart , this . lineEnd , 10 , this . lineStart . toString ( ) , this . lineEnd . toString ( ) , 3 , false , true ) ;
                    this . fillCircle ( this . closePt . x , this . closePt . y , 5 ) ;
                    this . drawVecFromLine ( this . lineStart , mousePt , 10 , '' , '' , 1 , true , true , false ) ; 
                    this . drawVecFromLine ( mousePt , this . closePt  , 10 , '' , '' , 1 , true , true , false ) ; 
                this . context2D . restore ( ) ;

                this . context2D . save ( ) ;
                this . context2D . translate ( this . closePt . x , this . closePt . y ) ;
                this . context2D . rotate ( angle ) ;
                this . drawCoordInfo ( 
                    '[' + ( this . closePt . x ) . toFixed ( 2 ) + '  ,  ' + ( this . closePt . y ) . toFixed ( 2 ) + " ]" ,
                    0 , 
                    0 
                 ) ;
                this . context2D . restore ( ) ;
                angle = vec2 . getAngle ( vec2 . difference ( this . lineEnd , this . lineStart ) , vec2 . difference ( mousePt , this . lineStart )  , false ) ;
                this . drawCoordInfo ( 
                   angle . toFixed ( 2 ) ,
                    this . lineStart . x + 10, 
                    this . lineStart . y + 10 
                ) ;
                
            }    
        }
    }
}

//获取canvas元素
let canvas: HTMLCanvasElement = document.getElementById( 'canvas' ) as HTMLCanvasElement;
let app: TestApplication = new TestApplication( canvas );
app . start ( ) ;

